Fix square bracket indents

example/example.swift

@@ -255,3 +255,11 @@ func foo () {
 let foo = CGRectMake(0, (5 - 2),
                      100,
                      200)
+
+
+let dict = [
+  "foo": "Bar",
+  "nest": [
+    "fadsf",
+  ],
+]

indent/swift.vim

@@ -12,6 +12,7 @@ let s:cpo_save = &cpo
 set cpo&vim
 
 setlocal indentexpr=SwiftIndent()
+setlocal indentkeys+=0[,0]
 
 function! s:NumberOfMatches(char, string)
   let regex = "[^" . a:char . "]"
@@ -31,6 +32,10 @@ function! SwiftIndent()
     return indent(previousNum) + &tabstop
   endif
 
+  if line =~ "^\\s*],\\?$"
+    return indent(previousNum) - &tabstop
+  endif
+
   " Indent multi line declarations see #19
   " Allow statements to also be in parens
   let numOpenParens = s:NumberOfMatches("(", previous)